/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ /* * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2012, 2016, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ * * cl_device and cl_device_type implementation for VVP layer. * * Author: Nikita Danilov * Author: Jinshan Xiong */ #define DEBUG_SUBSYSTEM S_LLITE #include #include "llite_internal.h" #include "vvp_internal.h" #include /***************************************************************************** * * Vvp device and device type functions. * */ /* * vvp_ prefix stands for "Vfs Vm Posix". It corresponds to historical * "llite_" (var. "ll_") prefix. */ static struct kmem_cache *ll_thread_kmem; struct kmem_cache *vvp_object_kmem; static struct kmem_cache *vvp_session_kmem; static struct kmem_cache *vvp_thread_kmem; static struct lu_kmem_descr vvp_caches[] = { { .ckd_cache = &ll_thread_kmem, .ckd_name = "ll_thread_kmem", .ckd_size = sizeof(struct ll_thread_info), }, { .ckd_cache = &vvp_object_kmem, .ckd_name = "vvp_object_kmem", .ckd_size = sizeof(struct vvp_object), }, { .ckd_cache = &vvp_session_kmem, .ckd_name = "vvp_session_kmem", .ckd_size = sizeof (struct vvp_session) }, { .ckd_cache = &vvp_thread_kmem, .ckd_name = "vvp_thread_kmem", .ckd_size = sizeof(struct vvp_thread_info), }, { .ckd_cache = NULL } }; static void *ll_thread_key_init(const struct lu_context *ctx, struct lu_context_key *key) { struct ll_thread_info *lti; OBD_SLAB_ALLOC_PTR_GFP(lti, ll_thread_kmem, GFP_NOFS); if (lti == NULL) lti = ERR_PTR(-ENOMEM); return lti; } static void ll_thread_key_fini(const struct lu_context *ctx, struct lu_context_key *key, void *data) { struct ll_thread_info *lti = data; OBD_SLAB_FREE_PTR(lti, ll_thread_kmem); } struct lu_context_key ll_thread_key = { .lct_tags = LCT_CL_THREAD, .lct_init = ll_thread_key_init, .lct_fini = ll_thread_key_fini, }; static void *vvp_session_key_init(const struct lu_context *ctx, struct lu_context_key *key) { struct vvp_session *session; OBD_SLAB_ALLOC_PTR_GFP(session, vvp_session_kmem, GFP_NOFS); if (session == NULL) session = ERR_PTR(-ENOMEM); return session; } static void vvp_session_key_fini(const struct lu_context *ctx, struct lu_context_key *key, void *data) { struct vvp_session *session = data; OBD_SLAB_FREE_PTR(session, vvp_session_kmem); } struct lu_context_key vvp_session_key = { .lct_tags = LCT_SESSION, .lct_init = vvp_session_key_init, .lct_fini = vvp_session_key_fini }; static void *vvp_thread_key_init(const struct lu_context *ctx, struct lu_context_key *key) { struct vvp_thread_info *vti; OBD_SLAB_ALLOC_PTR_GFP(vti, vvp_thread_kmem, GFP_NOFS); if (vti == NULL) vti = ERR_PTR(-ENOMEM); return vti; } static void vvp_thread_key_fini(const struct lu_context *ctx, struct lu_context_key *key, void *data) { struct vvp_thread_info *vti = data; OBD_SLAB_FREE_PTR(vti, vvp_thread_kmem); } struct lu_context_key vvp_thread_key = { .lct_tags = LCT_CL_THREAD, .lct_init = vvp_thread_key_init, .lct_fini = vvp_thread_key_fini, }; /* type constructor/destructor: vvp_type_{init,fini,start,stop}(). */ LU_TYPE_INIT_FINI(vvp, &ll_thread_key, &vvp_session_key, &vvp_thread_key); static const struct lu_device_operations vvp_lu_ops = { .ldo_object_alloc = vvp_object_alloc }; static struct lu_device *vvp_device_free(const struct lu_env *env, struct lu_device *d) { struct vvp_device *vdv = lu2vvp_dev(d); struct cl_site *site = lu2cl_site(d->ld_site); struct lu_device *next = cl2lu_dev(vdv->vdv_next); if (d->ld_site != NULL) { cl_site_fini(site); OBD_FREE_PTR(site); } cl_device_fini(lu2cl_dev(d)); OBD_FREE_PTR(vdv); return next; } static struct lu_device *vvp_device_alloc(const struct lu_env *env, struct lu_device_type *t, struct lustre_cfg *cfg) { struct vvp_device *vdv; struct lu_device *lud; struct cl_site *site; int rc; ENTRY; OBD_ALLOC_PTR(vdv); if (vdv == NULL) RETURN(ERR_PTR(-ENOMEM)); lud = &vdv->vdv_cl.cd_lu_dev; cl_device_init(&vdv->vdv_cl, t); vvp2lu_dev(vdv)->ld_ops = &vvp_lu_ops; OBD_ALLOC_PTR(site); if (site != NULL) { rc = cl_site_init(site, &vdv->vdv_cl); if (rc == 0) rc = lu_site_init_finish(&site->cs_lu); else { LASSERT(lud->ld_site == NULL); CERROR("Cannot init lu_site, rc %d.\n", rc); OBD_FREE_PTR(site); } } else rc = -ENOMEM; if (rc != 0) { vvp_device_free(env, lud); lud = ERR_PTR(rc); } RETURN(lud); } static int vvp_device_init(const struct lu_env *env, struct lu_device *d, const char *name, struct lu_device *next) { struct vvp_device *vdv; int rc; ENTRY; vdv = lu2vvp_dev(d); vdv->vdv_next = lu2cl_dev(next); LASSERT(d->ld_site != NULL && next->ld_type != NULL); next->ld_site = d->ld_site; rc = next->ld_type->ldt_ops->ldto_device_init( env, next, next->ld_type->ldt_name, NULL); if (rc == 0) { lu_device_get(next); lu_ref_add(&next->ld_reference, "lu-stack", &lu_site_init); } RETURN(rc); } static struct lu_device *vvp_device_fini(const struct lu_env *env, struct lu_device *d) { return cl2lu_dev(lu2vvp_dev(d)->vdv_next); } static const struct lu_device_type_operations vvp_device_type_ops = { .ldto_init = vvp_type_init, .ldto_fini = vvp_type_fini, .ldto_start = vvp_type_start, .ldto_stop = vvp_type_stop, .ldto_device_alloc = vvp_device_alloc, .ldto_device_free = vvp_device_free, .ldto_device_init = vvp_device_init, .ldto_device_fini = vvp_device_fini, }; struct lu_device_type vvp_device_type = { .ldt_tags = LU_DEVICE_CL, .ldt_name = LUSTRE_VVP_NAME, .ldt_ops = &vvp_device_type_ops, .ldt_ctx_tags = LCT_CL_THREAD }; #ifndef HAVE_ACCOUNT_PAGE_DIRTIED_EXPORT unsigned int (*vvp_account_page_dirtied)(struct page *page, struct address_space *mapping); unsigned int ll_account_page_dirtied(struct page *page, struct address_space *mapping) { /* must use __set_page_dirty, which means unlocking and * relocking, which hurts performance. */ ll_xa_unlock(&mapping->i_pages); __set_page_dirty(page, mapping, 0); ll_xa_lock(&mapping->i_pages); return 0; } #endif /** * A mutex serializing calls to vvp_inode_fini() under extreme memory * pressure, when environments cannot be allocated. */ int vvp_global_init(void) { int rc; rc = lu_kmem_init(vvp_caches); if (rc != 0) return rc; rc = lu_device_type_init(&vvp_device_type); if (rc != 0) goto out_kmem; #ifndef HAVE_ACCOUNT_PAGE_DIRTIED_EXPORT /* * Kernel v5.2-5678-gac1c3e4 no longer exports account_page_dirtied */ vvp_account_page_dirtied = (void *) cfs_kallsyms_lookup_name("account_page_dirtied"); if (!vvp_account_page_dirtied) vvp_account_page_dirtied = ll_account_page_dirtied; #endif return 0; out_kmem: lu_kmem_fini(vvp_caches); return rc; } void vvp_global_fini(void) { lu_device_type_fini(&vvp_device_type); lu_kmem_fini(vvp_caches); } /***************************************************************************** * * mirror obd-devices into cl devices. * */ int cl_sb_init(struct super_block *sb) { struct ll_sb_info *sbi; struct cl_device *cl; struct lu_env *env; int rc = 0; __u16 refcheck; sbi = ll_s2sbi(sb); env = cl_env_get(&refcheck); if (!IS_ERR(env)) { cl = cl_type_setup(env, NULL, &vvp_device_type, sbi->ll_dt_exp->exp_obd->obd_lu_dev); if (!IS_ERR(cl)) { sbi->ll_cl = cl; sbi->ll_site = cl2lu_dev(cl)->ld_site; } cl_env_put(env, &refcheck); } else rc = PTR_ERR(env); RETURN(rc); } int cl_sb_fini(struct super_block *sb) { struct ll_sb_info *sbi; struct lu_env *env; struct cl_device *cld; __u16 refcheck; int result; ENTRY; sbi = ll_s2sbi(sb); env = cl_env_get(&refcheck); if (!IS_ERR(env)) { cld = sbi->ll_cl; if (cld != NULL) { cl_stack_fini(env, cld); sbi->ll_cl = NULL; sbi->ll_site = NULL; } cl_env_put(env, &refcheck); result = 0; } else { CERROR("Cannot cleanup cl-stack due to memory shortage.\n"); result = PTR_ERR(env); } RETURN(result); } /**************************************************************************** * * debugfs/lustre/llite/$MNT/dump_page_cache * ****************************************************************************/ struct vvp_seq_private { struct ll_sb_info *vsp_sbi; struct lu_env *vsp_env; u16 vsp_refcheck; struct cl_object *vsp_clob; struct rhashtable_iter vsp_iter; u32 vsp_page_index; /* * prev_pos is the 'pos' of the last object returned * by ->start of ->next. */ loff_t vvp_prev_pos; }; static struct page *vvp_pgcache_current(struct vvp_seq_private *priv) { struct lu_device *dev = &priv->vsp_sbi->ll_cl->cd_lu_dev; struct lu_object_header *h; struct page *vmpage = NULL; rhashtable_walk_start(&priv->vsp_iter); while ((h = rhashtable_walk_next(&priv->vsp_iter)) != NULL) { struct inode *inode; int nr; if (IS_ERR(h)) { if (PTR_ERR(h) == -EAGAIN) continue; break; } if (!priv->vsp_clob) { struct lu_object *lu_obj; lu_obj = lu_object_get_first(h, dev); if (!lu_obj) continue; priv->vsp_clob = lu2cl(lu_obj); lu_object_ref_add_atomic(lu_obj, "dump", current); priv->vsp_page_index = 0; } inode = vvp_object_inode(priv->vsp_clob); nr = find_get_pages_contig(inode->i_mapping, priv->vsp_page_index, 1, &vmpage); if (nr > 0) { priv->vsp_page_index = vmpage->index; break; } lu_object_ref_del(&priv->vsp_clob->co_lu, "dump", current); cl_object_put(priv->vsp_env, priv->vsp_clob); priv->vsp_clob = NULL; priv->vsp_page_index = 0; } rhashtable_walk_stop(&priv->vsp_iter); return vmpage; } #define seq_page_flag(seq, page, flag, has_flags) do { \ if (test_bit(PG_##flag, &(page)->flags)) { \ seq_printf(seq, "%s"#flag, has_flags ? "|" : ""); \ has_flags = 1; \ } \ } while(0) static void vvp_pgcache_page_show(const struct lu_env *env, struct seq_file *seq, struct cl_page *page) { struct vvp_page *vpg; struct page *vmpage; int has_flags; vpg = cl2vvp_page(cl_page_at(page, &vvp_device_type)); vmpage = vpg->vpg_page; seq_printf(seq, " %5i | %p %p %s %s %s | %p "DFID"(%p) %lu %u [", 0 /* gen */, vpg, page, "none", vpg->vpg_defer_uptodate ? "du" : "- ", PageWriteback(vmpage) ? "wb" : "-", vmpage, PFID(ll_inode2fid(vmpage->mapping->host)), vmpage->mapping->host, vmpage->index, page_count(vmpage)); has_flags = 0; seq_page_flag(seq, vmpage, locked, has_flags); seq_page_flag(seq, vmpage, error, has_flags); seq_page_flag(seq, vmpage, referenced, has_flags); seq_page_flag(seq, vmpage, uptodate, has_flags); seq_page_flag(seq, vmpage, dirty, has_flags); seq_page_flag(seq, vmpage, writeback, has_flags); seq_printf(seq, "%s]\n", has_flags ? "" : "-"); } static int vvp_pgcache_show(struct seq_file *f, void *v) { struct vvp_seq_private *priv = f->private; struct page *vmpage = v; struct cl_page *page; seq_printf(f, "%8lx@" DFID ": ", vmpage->index, PFID(lu_object_fid(&priv->vsp_clob->co_lu))); lock_page(vmpage); page = cl_vmpage_page(vmpage, priv->vsp_clob); unlock_page(vmpage); put_page(vmpage); if (page) { vvp_pgcache_page_show(priv->vsp_env, f, page); cl_page_put(priv->vsp_env, page); } else { seq_puts(f, "missing\n"); } return 0; } static void vvp_pgcache_rewind(struct vvp_seq_private *priv) { if (priv->vvp_prev_pos) { struct lu_site *s = priv->vsp_sbi->ll_cl->cd_lu_dev.ld_site; rhashtable_walk_exit(&priv->vsp_iter); rhashtable_walk_enter(&s->ls_obj_hash, &priv->vsp_iter); priv->vvp_prev_pos = 0; if (priv->vsp_clob) { lu_object_ref_del(&priv->vsp_clob->co_lu, "dump", current); cl_object_put(priv->vsp_env, priv->vsp_clob); } priv->vsp_clob = NULL; } } static struct page *vvp_pgcache_next_page(struct vvp_seq_private *priv) { priv->vsp_page_index += 1; return vvp_pgcache_current(priv); } static void *vvp_pgcache_start(struct seq_file *f, loff_t *pos) { struct vvp_seq_private *priv = f->private; if (*pos == 0) { vvp_pgcache_rewind(priv); } else if (*pos == priv->vvp_prev_pos) { /* Return the current item */; } else { WARN_ON(*pos != priv->vvp_prev_pos + 1); priv->vsp_page_index += 1; } priv->vvp_prev_pos = *pos; return vvp_pgcache_current(priv); } static void *vvp_pgcache_next(struct seq_file *f, void *v, loff_t *pos) { struct vvp_seq_private *priv = f->private; WARN_ON(*pos != priv->vvp_prev_pos); *pos += 1; priv->vvp_prev_pos = *pos; return vvp_pgcache_next_page(priv); } static void vvp_pgcache_stop(struct seq_file *f, void *v) { /* Nothing to do */ } static const struct seq_operations vvp_pgcache_ops = { .start = vvp_pgcache_start, .next = vvp_pgcache_next, .stop = vvp_pgcache_stop, .show = vvp_pgcache_show }; static int vvp_dump_pgcache_seq_open(struct inode *inode, struct file *filp) { struct vvp_seq_private *priv; struct lu_site *s; priv = __seq_open_private(filp, &vvp_pgcache_ops, sizeof(*priv)); if (!priv) return -ENOMEM; priv->vsp_sbi = inode->i_private; priv->vsp_env = cl_env_get(&priv->vsp_refcheck); priv->vsp_clob = NULL; if (IS_ERR(priv->vsp_env)) { int err = PTR_ERR(priv->vsp_env); seq_release_private(inode, filp); return err; } s = priv->vsp_sbi->ll_cl->cd_lu_dev.ld_site; rhashtable_walk_enter(&s->ls_obj_hash, &priv->vsp_iter); return 0; } static int vvp_dump_pgcache_seq_release(struct inode *inode, struct file *file) { struct seq_file *seq = file->private_data; struct vvp_seq_private *priv = seq->private; if (priv->vsp_clob) { lu_object_ref_del(&priv->vsp_clob->co_lu, "dump", current); cl_object_put(priv->vsp_env, priv->vsp_clob); } cl_env_put(priv->vsp_env, &priv->vsp_refcheck); rhashtable_walk_exit(&priv->vsp_iter); return seq_release_private(inode, file); } const struct file_operations vvp_dump_pgcache_file_ops = { .owner = THIS_MODULE, .open = vvp_dump_pgcache_seq_open, .read = seq_read, .llseek = seq_lseek, .release = vvp_dump_pgcache_seq_release, };